<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
  .box{
        position: fixed;
        right:30px;
        top:30px;

          }

  
  
  </style>
</head>
<body>
  
  <span>我是span元素</span>
  <strong class="box">我是strong元素</strong>
  <img src="../images/muxing.jpg" alt="">
  <div>我是div元素</div>
</body>
</html>